[bercianor]

Summary

• Reuse one journal sequencer per stream within each factory so separate persistence consumers share confirmed sequence progress.
• Seed each stream from its durable journal tail only on first access.
• Keep persistence instances independent, with no changes to the backfill system change or local payload deduplication.

Testing

• Observed RED: two factory tests failed with independent counters before the fix.
• Focused factory tests pass after the fix.
• Core module suite: 350 tests passed, none skipped.
• Core module spotlessCheck and git diff --check passed.
• Maintainer additionally reports successful full builds and complete test suites on both the master-based fix and the backfill branch with the fix applied.

Scope

• Independent fix based on master; complements feat(core): add audit history journal backfill change #982 without modifying its backfill implementation.
• Existing stage-lock serialization and durable-write confirmation semantics remain unchanged.